Automatic air temperature control



June 21, 1932. c. H. ROOT AUTOMATIC AIR TEMPERATURE CONTRQL Filed Feb.26. 1931 jg z.

INVENTOR ATTORNEY Patented June 21, 1932 cam. 11. Room, or nmon', momentauromrrc AIR rnmnnhmn comaor.

Application filed February 28, 1931. Serial No. 518,558.

This invention relates to thermostatic heat control for the air enteringthe carbureter of an internal combustion e gine.

A primar object of the invention is to so construct a evice of thischaracter that it will furnish air to the carbureter at a temperaturewhich gives the greatest efliciency to the motor. 4

Another object of the invention is to so construct such a device that alarge area of heating surface will be in contact with the exhaust pipeand thereby warm the motor quickly in cold weather. I

Stillanother object is to so construct such a device that it will beautomatic in its operation, avoiding the necessity of the usual manualcontrol.

In carrying out these objects, the invention is susceptible of a widerange of modification without departin from the spirit or sacrificingany of the a vantages of the claimed invention; there being shown in thedrawin for illustrative purposes a preferred and practical form, inwhich:

Figure 1 is a side elevation of a portion of an engine equipped withthis improved temperature control;

Fig. 2 is a longitudinal section through the device constituting theinvention;

Fig. 3 is a transverse section taken on the line 3-3 of Fig. 2; and

Fig. 4 is a slmilar view taken on the line 4-4 of Fig. 2.

In the embodiment illustrated the device constituting this inventioncomprises a cylindrical jacket 1 designed to encircle the exhaust pipe Eof an internal combustion engine and made larger than said exhaust topermit the free circulation of air around the exhaust, between it and.the jacket. This jacket 1 has an enlarged mouth 2 at its outer endthrough which cold air is designed to enter the jacket and be drawn intothe jacket by the suction of motor. This jacket 1 may encircle theentire exhaust pipe or only a portion and other elements.

thereof as may be desired and has extending laterally therefrom a pipe 2through which hot air is designed to be conveyed to the carbureter airintake shown at AI in 1 of the drawing, the carbureter being in 59 catedat C.

A thermostat 10 is located within the pipe 2 and is here shown extendedlongitudinall thereof and includes a shaft or rod 11 whic is journalledor supported in suitable spiders 3 and 4 located at suitably spacedintervals in the pipe 2. The shaft 11 has a small disk 12 fixed to theend thereof beyond the sup port 3 and is designed for a purposepresently to be described. The support 3 is fixedly 5 mounted ona'slidable sleeve 4 fitted within the pipe 2 and designed to be moved bythe expansion and contraction of the thermostat 10 as will be presentlyhereinafter more fully described. This sleeve 4 operates as a valve 05for bringing into and cutting oif communig cation between the interiorof the pipe 2 and the outer atmosphere. The tube 2 is provided with aplurality of openings 5 arranged circumferentially around the tube andover which the sleeve 4 is designed to slide to cover and uncover themaccording to the heat within the tube. .Fixedly mounted in the tube 2 inrear of the thermostat and disk 12 carried thereby is an annular plate 6through 7 which the hot air from pipe 1 is designed to pass and theopening in which shown at 7 is covered or uncovered by the disk 12controlled by the thermostat 10.

A truncated cone-shaped deflector 8 is mounted on the outside of thepipe 2 around the openings 5 therein and secured in any suitable mannerwith its flared mouth facing outwardly. This deflector is designed topro tect the openings 5 against entrance of dirt In the use of thisdevice it being installed as shown in Fig. 1, the suction from the engine will draw the air in through the pipes 1' and 2 and through the airintake pipe AI to the carbureter and from thence to the engine. The heatfrom the exhaust E will heat the air passing through these pipes andwhen the passing air becomes heated to. vaflpredetermined point thethermostat 10 expandmoving the disk 12 over the opening 7 in thepartition 7 cutting off the entrance of further air and openmg theopenings 5 by the removal of the sleeve or sliding valves 4 from overthem.

When the air in tube 2 has become sufficiently cool by the entrance ofthe outside air through openings 5 the thermostat 10 will contract andthus uncover the opening 7 in the partition 6 and permit the heated airfrom beyond to continue passing through the tube to the carbureter.

It will thus been seen that the temperature air to enter the hot airpipe for conduction to the carbureter, a disc secured inwthe hot airpipe between the heater and the openings in the hot air pipe and locatedat a right angle to the axis of the hot air pipe, said disc hav-' ing anopening to permit ot air from the heater to pass directly to thecarbureter, a

second valve movable axially of-the hot air pipe connected to thethermostat and adapted to close the opening in the disc when the annularvalve has been moved from the openings in the hot air pipe.

' CARL H; ROOT.

of the air fed to the carbureter through the airintake thereof will becontrolled automatically by means of the thermostat 10 and hence afterthe device has once been installed no further attention will benecessary.

Without further description it is thought that the features andadvantages of the 1nvention will be readily apparent to those skilled inthe art, and it will, of course, be

understood thatv changes in the form, proportion and minor details ofconstruction may be resorted to, without departing from the spirit ofthe invention or its scope as claimed.

I claim:

1. In the combination with the exhaust pipe of an internal combustionengine, an

air heater associated with said pipe, a hot air pipe leading from saidheater and connected with the air intake of a carbureter,

the hot air pipe havin a pluralit of circumferentiall dispose passagesor placingthe hot air pipe in communicatlon with the atmosphere nectedbetween the 'spiders for causing the cular plate fitting the passages inthe hot air pipe pipe of an internal rectly with the atmosphere,

' air pipe and when the temperature of the air 1s mcreased a sleevewithin the hot air pipe and movable over said openings, a spider securedto said sleeve, a second spider secured to the interior of the hot airpipe, a thermostat located within the hot air pipe and consuflicientlythe thermostat will move the valve from the openings and permitatmospheric

